Answer
$14x^2-53x+14$
Work Step by Step
Using $(a+b)(c+d)=ac+ad+bc+bd$ or the product of $2$ binomials, the given expression, $
(7x-2)(2x-7)
$, is equivalent to
\begin{array}{l}\require{cancel}
7x(2x)+7x(-7)-2(2x)-2(-7)
\\\\=
14x^2-49x-4x+14
\\\\=
14x^2-53x+14
.\end{array}